Re: [linux-usb-devel] spontaneous disconnect with "usb-storage: implement autosuspend"

[Mark Lord <lkml@rtr.ca>]

Greg KH wrote:
> On Wed, Sep 12, 2007 at 06:14:04PM -0400, Mark Lord wrote:
> > Oliver Neukum wrote:
> > > Am Dienstag 14 August 2007 schrieb Paolo Ornati:
> > > > On Tue, 14 Aug 2007 17:46:16 +0200
> > > > Oliver Neukum <oliver@neukum.org> wrote:
> > > >
> > > > > Am Dienstag 14 August 2007 schrieb Paolo Ornati:
> > > > > > Hewlett-Packard PhotoSmart 720 / PhotoSmart 935 (storage)  
> > > > > Please try this patch.
> > > > Tried on -rc3 but it doesn't work, dmesg attached.
> > > >
> > > > However I've found that if "hald" is running the problems doesn't
> > > > happen (I think it's just hidden by the fact that hald do some polling
> > > > on it preventing autosuspend to trigger).
> > > Exactly. This is not reliable. It needs to be done in kernel. This patch
> > > should do it.
> > > 	Regards
> > > 		Oliver
> > > ---
> > > --- a/drivers/usb/core/quirks.c	2007-08-14 17:42:22.000000000 +0200
> > > +++ b/drivers/usb/core/quirks.c	2007-08-14 20:30:28.000000000 +0200
> > > @@ -30,6 +30,8 @@
> > >  static const struct usb_device_id usb_quirk_list[] = {
> > >  	/* HP 5300/5370C scanner */
> > >  	{ USB_DEVICE(0x03f0, 0x0701), .driver_info = USB_QUIRK_STRING_FETCH_255 
> > > },
> > > +	/* Hewlett-Packard PhotoSmart 720 / PhotoSmart 935 (storage) */
> > > +	{ USB_DEVICE(0x03f0, 0x4002), .driver_info = USB_QUIRK_NO_AUTOSUSPEND },
> > >  	/* Acer Peripherals Inc. (now BenQ Corp.) Prisa 640BU */
> > >  	{ USB_DEVICE(0x04a5, 0x207e), .driver_info = USB_QUIRK_NO_AUTOSUSPEND },
> > >  	/* Benq S2W 3300U */
> > > -
> > I believe the offending commit needs to be reverted.
> > It just breaks too much stuff, including my Sandisk USB sticks.
> >
> > > with "CONFIG_USB_SUSPEND=y", since commit:
> > > 8dfe4b14869fd185ca25ee88b02ada58a3005eaf
> > >     usb-storage: implement autosuspend
> > >         This patch (as930) implements autosuspend for usb-storage.  It is
> > >     adapted from a patch by Oliver Neukum.  Autosuspend is allowed except
> > >     during LUN scanning, resets, and command execution.
> > > my USB photo-camera gets automagically disconnected before I can do
> > > anything with it  ;) 
> > Ditto for several other devices that are being slowly special-cased,
> > and many that have yet to be tested.  This commit is (unfortunately)
> > a disaster with many regressions.
>
> There are many regressions right now, _ONLY_ if you enable
> CONFIG_USB_SUSPEND.  If you disable that, your problems will go away,
> right?
>
> This option is a new option, and we have found out the hard way that
> a very large class of hardware really does not like working with usb
> suspend at all.

CONFIG_USB_SUSPEND is *not* a new config option.
It's been around for quite some time now, and I also had it
enabled in 2.6.22 without any troubles.  Definite regression here, folks!

Cheers
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